Generation of Localized Noninductive Current by Electron Cyclotron Waves on the DIII-D Tokamak

Journal Article · Mon Nov 29 00:00:00 EST 1999 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.83.4550· OSTI ID:20217978

Luce, T C ^[1]; Lin-Liu, Y R ^[1]; Harvey, R W ^[2]; Giruzzi, G ^[3]; Politzer, P A ^[1]; Rice, B W ^[4]; Lohr, J M ^[1]; Petty, C C ^[1]; Prater, R ^[1]

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1. General Atomics, San Diego, California 92186-5608 (United States)
2. CompX, Del Mar, California 92014 (United States)
3. CEA-Centre d'Etudes de Cadarache, Saint Paul Lez Durance, (France)
4. Lawrence Livermore National Laboratory, Livermore, California 94551-9900 (United States)

Localized currents due to electron cyclotron current drive have been measured for the first time in experiments on the DIII-D tokamak. The location of driven current in the plasma has been varied from near the center of the tokamak out to half of the minor radius. The measured current drive efficiency agrees with quasilinear Fokker-Planck calculations near the center and exceeds the predicted value with increasing minor radius. Reduction of the trapped electron fraction due to finite collisionality is a leading candidate to explain the discrepancy. (c) 1999 The American Physical Society.

• OSTI ID: 20217978
• Journal Information: Physical Review Letters, Vol. 83, Issue 22; Other Information: PBD: 29 Nov 1999; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELECTRON CYCLOTRON-RESONANCE
CURRENT-DRIVE HEATING
DOUBLET-3 DEVICE
TOKAMAK DEVICES
FOKKER-PLANCK EQUATION
TRAPPED ELECTRONS
EXPERIMENTAL DATA
THEORETICAL DATA